Question: ( B ) x = 3 1 ; Y = 2 6 ; Z = 3 5 ( E ) x = 2 6 ;

(B)x=31;Y=26;Z=35
(E)x=26;Y=31;Z=28
The compressive strength (CS) was determined for
same concrete using cylinders of two sizes: results
are tabulated along with calculated coefficient of
variation (COV), as shown. The reasonable values
for (L&M)i(N&O) are
(A)(28&26); (7%&5%)
(D)(26&28);(5%&7%)
(B)(26&28);(7%&5%)
(C)(28&26);(5%&7%)
(E)(28&28);(5%&7%)
(F)(28&28);(7%&5%)
( B ) x = 3 1 ; Y = 2 6 ; Z = 3 5 ( E ) x = 2 6 ;

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